A patient is diagnosed with a disorder in which deoxygenated blood is having difficulty returning to the heart and lungs for reoxygenation. In which part of the peripheral vascular system is the origin of this patient's disorder?
1. arteries
2. arterioles
3. capillaries
4. venules
Correct Answer: 4
In the capillary beds, oxygen and nutrients are exchanged for metabolic wastes, and deoxygenated blood begins its journey back to the heart through venules, the smallest vessels of the venous network. The venous network is where the problem with blood returning to the heart resides. Arteries and arterioles are vessels within the arterial network, not the venous network.
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